Rotary table



V. L. DU BOIS ROTARY TABLE Nov. 13, 1951 3 Sheets-Sheet 1 Filed April 18, 1946 l///"g// L 01/50/5 Q Nov. 13, 1951 MN I v. DU 8015 2,574,914

ROTARY TABLE 3 Sheets-Sheet 2 Mfg/7 L; M15015 INVENTOR v. L. DU BOIS ROTARY TABLE Nov. 13 1951 5 Sheets-Sheet 3 Filed April 18, 1946 l/f/gfi- 4.. DU 50/5 AITORN EY Patented Nov. 13, 1951 UNITED-- STATES PATENT 1 OFF ROTARY mete.

Virgil '12; Du Bois, Tulsa, Okla.

Application April 18, 1946;.Se1'ia1'lNoa 653,208

ljOl'aim (Cl. Mir-59).

table so that the axis of the rotary table may be. in a vertical or horizontal position, according to. the nature of the workto. be done.

A further object isto provide arotary table comprising a stationary base havinga rotary head. thereon, anda head-provided with an inwardly extending annular flange-within thebase, and provided-with. a wormgear actuated by. aworm for rotating the head inirelation to; the. base to various degrees. Also to mount the worm shaft in aneccentrically -mounted hearing so that the wormcan be easily andquickly; movedout'of and into mesh with theaworm; gear; thereby allowing thev rotary-head: to be quickly rotatedwithout the aid of the. worm, andthen, usingthe; wormto accurately position-the; Work to various degrees.

A further object is to provide the, rotary head and stationarybase with registering engaging inwardly V-shaped annular flanges which flanges are received in a V-shaped groove in the outer periphery of an expansible locking ring sogtherotating head may be easily and quickly unlocked, then 1ocked,,afterit is adjustedto the proper degree.

A further object is to prov-idea tapered bearing sleeve interposed between atapered bearing surface ofthe stationary baseand the rotatable head, and means for adjustingsaid tapered bearingsleeve for taking up wear thereon.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawings, described and claimed, it being understood that changes in the precise embodiment of the invention may be made Within the scope of what is claimed without departing from the spirit of the invention.

In the drawings:

Figure 1 is a perspective view of the rotatable table.

Figure 2 is a vertical longitudinal sectional view through the rotatable table.

Figure 3 is a side elevation of the table.

Figure 4 is a vertical transverse sectional view through the lower portion of the table, taken on line 44 of Figure 2.

Figure 5 is a perspective View of the segmental locking ring.

Figure 6 is a detail perspective view of a portion of the base, showing the transverse stop pin for engaging one endlof the-. ex-pansible ring during the locking. operation.

Referring to the. drawings, the numeral l designates the stationary base of the table and 2 the rotatable headv carried thereby. The adjacent faces ,3. ofthe base and head have a ground engagement and areprovided with registering engaging. V-shaped annular flanges l extending into the V.-shaped annular channel 5..of the expflnsible locking ring 6, which ring is adapted to, lock the head against rotationon the baseafter the head has been properly adjusted according to the degree scale. ion the head. The expansible ring 6 is, formed from segments 8., the adjacent ends of which.areprovidedwith rock joints}, so.that

whenthe ring is. expanded therewill be. a posi tive uniform engagement of the. ring with the registering flanges 4;

Extending through the annular flange; 4, care ried by the base,.l.is atransver'se stop pin l0 engagedby the end II of the expansible ring, for holding that end against circumferential movement during theexpanding operation. The ring isexpandedfby.aninwardly and downwardly inclined adjusting screw. 12, threaded through an adjusting bushing L3,. threadedinto the base I, The; nose .I 40f the ad ustingscrew l2 engages the end',of the expansionringas shownlinFigure 5; hence it will be seen that the-locking ringmay be. easily and quickly. xpan edv for o in the rotary head 2 againstrotation, in relation to the base, and quickly, released'to allow a freerotati'onof the. h ad, th r. by an pera n scre reinafter. set fort man a ly; or. a. u k adiu tmen hwhenthe operat n screw is. n n: operative position.

The rotating head 2 is provided with an inwardly extending annular flange l5 surrounding a tapered annular flange l6 within and forming a part of the head I, and on the flange I5 is locked, by anchor screws IT, a worm gear [8, utilized for the rotatable adjustment of the head. Interposed between .the flanges I5 and I6 is a tapered sleeve l8 forming a bearing between the parts and sleeve i3 is adjusted inwardly from time to time by adjusting screws I9 for taking up the wear on the parts, incident to use. A dust and oil ring 20 is interposed between the parts for excluding foreign matter.

Worm gear I8 is rotated by a worm 2! which meshes with the underside of the worm gear and is carried by a rotatable shaft 22. The rotatable shaft 22 is rotated in a bearing 23 in an eccentric position in the rotatable adjusting member 24, mounted in a bearing 25 in the base adjacent its lower side. The bearing member 24 is held in various rotated positions by a set screw 26 which extends inwardly and cooperates with an annular V-shaped channel 21 in the outer periphery of the bearing member 24. It will be seen that by rotating the bearing member 24 clockwise that the worm 2| can be moved downwardly and outwardly in the dotted line position shown in Figure 2, and out of driving engagement with the worm gear l8, and under which conditions the expansion ring screw |2 may be loosened and the rotatable head may be manually rotated for quick adjustment to any degree desired, and after which the parts are locked together by the expansion ring and the rotatable bearing member I4 can be again rotated anti-clockwise for again engaging the worm 2| and the worm gear l8.

The outer end of the shaft 22 is provided with adjusting nuts 28, which act against a washer 29, and by means of which the worm shaft 22 can be axially adjusted to reduce the end play, caused by wear. Also mounted on the outer end of shaft 22, by means of a set screw 30, is a calibration collar 3| having calibrations 32 thereon, which have a relation to the scale or calibrations I on the rotating head. The worm is preferably of the single lead type, and the worm gear provided with eighty teeth, therefore it takes eighty revolutions of the worm to make the head revolve once. On this basis one complete revolution of the worm will rotate the head four and one half degrees. Eighty teeth into three hundred and sixty degrees equal four and one half degrees for each tooth, therefore the calibration collar 3| is cut into four and one half degrees, with divisions between each degree representing two and one half minutes. By turning the worm shaft one graduation of the collar would represent two and one half minutes turn of the head. In other words, if the collar is turned from zero to ten, the head would have rotated ten minutes or one sixth of one degree. This particular arrangement makes for very accurate manipulation and easy control. Although particular degrees and proportions are set forth, it is to be understood that applicant does not limit himself in this particular.

When the axis of the device is used in a horizontal position it is held on the machine table by headed bolts extending through slots 32 in the lower end of the stationary base When it is desired to place the device on the machine table with its axis vertical, the base is placed on the table on its back, and headed bolts are passed through the T-slot 33 in the back of the base. The outer face of the rotatable head is provided with the usual radial T-slots 34 for clamping work in the device.

From the above it will be seen that a rotating table is provided for metal working machinery, which is simple in construction, and one whereby a microscopic adjustment may be easily and quickly obtained, either through the adjusting screw or manually and that all the parts can be quickly locked in adjusted position by the expansible locking ring.

The invention having been set forth what is claimed as new and useful is:

A rotary table for metal working machines, said table comprising a base adapted to be secured to a metal working machine table, a rotating head carried by said base, means within the base for rotating the head, engaging flanges carried by the head and base, an expansion member within the head and base and cooperating with the engaging flanges of the head and base for locking the head and base together said expansion member being formed from a plurality of arcuate members circumferentially arranged and having V-shaped grooves in their outer faces, adjacent ends of two of said arcuate members being spaced apart, a stop carried by the engaging flanges and engaging one of said adjacent ends, a substantially tangential adjusting and. expanding screw cooperating with the other adjacent ends and forming means for expanding said expansion member, said adjacent engaging ends of the arcuate members forming the expansion member being rockably engaged for independent movement in the plane of the expansible member, said rockable engagement comprising transverse ribs carried by ends of the arcuate members and rockable in transverse grooves carried by the ends of adjacent members.

VIRGIL L. DU 3018.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,047,270 Miller Dec. 17, 1912 1,446,829 Burrell et al Feb. 27, 1923 1,934,358 Kylin Nov. 7, 1933 2,059,753 Scott et a1. Nov. 3, 1936 2,170,888 Abel Aug. 29, 1939 2,364,478 Schreiber Dec. 5, 1944 

